Beautiful! So happy for you. :)
Weekly, I share with my counselor less significant but still similar moments. At first, I would apologize for thinking they were so important and for feeling so hopeful about them, but she agreed with me that these little steps, all going in the right direction, were actually huge.
Our stories--yours and mine--are remarkably alike. My SLAWH and I have been married almost 23 years; he met OW in Jun '12 and carried on an EA/PA with her until Nov '12 when she dropped him. He acted out with a prostitute and 2 escorts in Dec '12/Jan '13, confessed end of Jan '13, and committed some less heinous (but still hurtful) crimes like porn/hook-up sites for 6 months and continued his "friendship" with her until 4 months (?) ago. Recently, he told me that I'm the best thing that's ever happened to him. I am. I know it. But hearing that he recognizes it is both soothing and exciting.
My hat's off to you. You ARE admirable!!! And kudos to your WH for having the courage to say it.